mite vs rust mite

mite and rust mite both are nouns.

Word	Noun	Adjective	Verb	Adverb
mite	Yes	No	No	No
rust mite	Yes	No	No	No

As nouns, rust mite is a hyponym of mite; that is, rust mite is a word with a more specific, narrower meaning than mite:

mite: any of numerous very small to minute arachnids often infesting animals or plants or stored foods
rust mite: any of several varieties of mite that burrow into plants and cause a reddish-brown discoloration on the leaves or fruit

mite (noun)	rust mite (noun)
any of numerous very small to minute arachnids often infesting animals or plants or stored foods	any of several varieties of mite that burrow into plants and cause a reddish-brown discoloration on the leaves or fruit
a slight but appreciable amount